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还剩3天中考~i saw him get on the bus just now.为什么不可以getting

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还剩3天中考~i saw him get on the bus just now.为什么不可以getting
还剩3天中考~i saw him get on the bus just now.为什么不可以getting
see、hear等词后面,①如果说是经常做某事,或者是看见某人做某事的全过程用【原型】,例如:I often see her sing under the tree(经常);I saw him walk out of the house(全过程).
②正在做某事用【现在分词】I heard someone shouting for help(我听到有人正在喊救命).